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I guess my first question would be is why are you moving to a new domain? If at all possible if you are ranking on your existing domain I would try and keep your site on there, even if you are moving to a completely new CMS and server there are ways to ensure your URL structure maps over so each URL can be replaced 1-for-1 with a new page on the new site - if this is what you are doing?

In that case it doesn't really sound like you can stick with the original domain, so as Prasad suggested I would go with the 301 and the Google WMT Change of Address.

To avoid getting too many WMT errors you might also want to spider your existing site with something like screaming frog to ensure you catch all the existing URLs and point them to the right place on the new site.

You could also potentially contact people who have linked to your existing domain and ask them to change the link to your new domain.

First you must have a process to redirect all the current ulrs to new domain's urls, using 301 permanent redirection. It will pass about 95 % of link juice to your new urls.

And also set the new domain on Google Webmaster Tools and set the old domains settings as you have moved your site to new domain. Hope you know how you can do it.

But I have no idea about your new website. Because of the new contents on your new urls maybe different than the current contents on current urls and up to the on page optimization of the new pages can be affects to your ranking. It maybe higher or lower. Because this is not just url updating.

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